The Mets are flip-flopping their piggybacking starters for Sunday’s game against the Nationals, a possible indication of their postseason plans.

Sean Manaea will start the series finale with Clay Holmes slated to follow him out of the bullpen, a reversal of the previous time the veteran hurlers pitched as a tandem Tuesday against the Padres.

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Holmes, a closer in previous years, is more accustomed to a bullpen role with 307 relief appearances in his eight-year MLB career, including two All-Star appearances with the Yankees.

The 32-year-old righty Holmes signed a three-year deal worth $38 million with

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